Skylotec The Duffle bag, 90 litre, is a black hole when it comes to storage. For long trips or short trips, with your entire climbing rig or most of your wardrobe, this is the bag for you. It has a zipped outer pocket, zipped mesh pocket on the inside of the lid and is made of robust, water-resistant tarpaulin PVC and 1200 D Polyester. Wide shoulder straps, which double up as backpack straps, mean the Duffle bag is comfortable to carry even when fully loaded.